It being low tide and a fine afternoon, the beach was for the time being turned into a highway, broader and smoother than any race-course could be, over which all manner of vehicles were being driven, from the old-fashioned gig of the village doctor to the aristocratic landau, fresh from town. The sands are hard and gently shelving, with here and there a fresh-water brooklet trickling through the bulk-head of ballast heaped up at the top by the sea. These little streams, after channeling the beach a certain distance, disappeared in the sand, just as the Platte and Arkansas sink out of sight into the plain. There was a fresh breeze outside, so that the coasters bowled merrily along with bellying sails before it, or else bent until gunwale under as they hugged it close. The color of the sea had deepened to a steely blue. White caps were flying, and the clouds betokened more wind as they rose and unrolled like cannon-smoke above the horizon, producing effects such as Stanfield liked to transfer to his canvas. Mackerel gulls were wheeling and circling above the breakers with shrill screams. Down at low-water mark the seas came bounding in, driven by the gale, leaping over each other, and beating upon the strand with ceaseless roar. The beach, I saw, had been badly gullied by the late storm, but the sea, like some shrewish housewife, after exhausting its rage, had set about putting things to rights again. I found shells of the deep-sea mussel, of quahaug and giant sea clam, bleaching there, but did not see the small razor-clam I have picked up on Nahant and other more southerly beaches. The sea-mussel, as I have read, was in the olden time considered a cure for piles and hemorrhoids, being dried and pulverized for the purpose. William Wood speaks of a scarlet mussel found at Piscataqua, that, on being pricked with a pin, gave out a purple juice, dying linen so that no washing would wear it out. "We mark our handkerchiefs and shirts with it," says this writer.[71] The large mussel is very toothsome. Like the oyster and clam, it was dried for winter use by the Indians.